You will get Your Excel or Google Sheets spreadsheet turned into an offline web app
Project details
Your spreadsheet works. The problem is everything around it: it breaks when someone types in the wrong cell, it's painful to use on a phone, formulas get overwritten, and you can't hand it to a client or a new hire without a training session.
I convert working spreadsheets into a single-file web app. Same logic, same calculations — but with a real interface, proper input validation, and no way for anyone to accidentally destroy a formula.
What you get:
• Clean forms instead of raw cells
• Your formulas rebuilt exactly, verified against your original file
• Works on phones and tablets, not just desktop
• Exports back to CSV whenever you need it
• Runs offline — one file, no server, no subscription, no login
Common conversions: quoting and pricing sheets, timesheets, job and site logs, inventory counts, commission calculators, budget planners, order forms, checklists.
Send me the spreadsheet and tell me what breaks in it. I'll tell you exactly what the app version will look like before you buy.
I've run a digital products business for 4 years with 4,000+ orders delivered, and I build and sell my own offline apps — this is the same code I ship to my own paying customers.
I convert working spreadsheets into a single-file web app. Same logic, same calculations — but with a real interface, proper input validation, and no way for anyone to accidentally destroy a formula.
What you get:
• Clean forms instead of raw cells
• Your formulas rebuilt exactly, verified against your original file
• Works on phones and tablets, not just desktop
• Exports back to CSV whenever you need it
• Runs offline — one file, no server, no subscription, no login
Common conversions: quoting and pricing sheets, timesheets, job and site logs, inventory counts, commission calculators, budget planners, order forms, checklists.
Send me the spreadsheet and tell me what breaks in it. I'll tell you exactly what the app version will look like before you buy.
I've run a digital products business for 4 years with 4,000+ orders delivered, and I build and sell my own offline apps — this is the same code I ship to my own paying customers.
Programming Languages
HTML & CSS, JavaScriptCoding Expertise
Cross Browser & Device Compatibility, Performance Optimization, DesignWhat's included
| Service Tiers |
Starter
$110
|
Standard
$245
|
Advanced
$420
|
|---|---|---|---|
| Delivery Time | 4 days | 7 days | 12 days |
Number of Revisions | 2 | 3 | 5 |
Number of Pages | 1 | 3 | 6 |
Design Customization | - | ||
Content Upload | |||
Responsive Design | |||
Source Code |
Optional add-ons
You can add these on the next page.
Fast Delivery
+$45 - $120
Additional Page
(+ 2 Days)
+$45
Design Customization
(+ 1 Day)
+$40
Activation Key System
(+ 2 Days)
+$75
Printable PDF Report
(+ 1 Day)
+$50Frequently asked questions
About MARIAN-AURELIAN
Web App Developer | Single-File Offline Tools & AI App Conversions
Baia Mare, Romania - 7:48 am local time
Two things I do most:
CONVERTING AI-BUILT APPS INTO FILES YOU OWN
You built something with Lovable, Base44, Bolt or Replit. It works, until the credits run out, the platform changes something, or you realise you cannot actually export it. I rebuild it in plain HTML, CSS and JavaScript, replace the backend with local storage, migrate your data, and fix whatever was already broken. You get one file plus the full commented source code.
TURNING SPREADSHEETS AND MANUAL PROCESSES INTO REAL TOOLS
Formulas become buttons and charts. The pricing rules that live in one person's head become a calculator anyone on the team can use. I have built garden planners, budget trackers, vehicle logs, quote calculators and rehabilitation journals — anything one person or one team uses, where the data does not need to sync live between strangers.
WHY THE OFFLINE PART MATTERS
Your data stays on your machine. Nothing is uploaded, no analytics, no network requests. For anyone handling client, financial or health data, that is usually the reason they came looking in the first place.
WHAT I WILL NOT BUILD
Anything needing user accounts, payments, or a shared live database between many users. Those need a server, and I will tell you that before we start rather than halfway through. I would rather turn down work than deliver something that cannot do what you need.
WHAT I BRING BESIDES CODE
I run my own e-commerce business: 400+ products across Shopify, Etsy and eMAG, and 4,000+ digital orders delivered over four years. I have priced a catalogue, chased a margin and fixed my own SEO. So I understand why a business needs a tool, not only how to build one.
Send me your project or your spreadsheet and I will tell you honestly whether it fits, what it would cost and how long it would take.
Steps for completing your project
After purchasing the project, send requirements so MARIAN-AURELIAN can start the project.
Delivery time starts when MARIAN-AURELIAN receives requirements from you.
MARIAN-AURELIAN works on your project following the steps below.
Revisions may occur after the delivery date.
Spreadsheet audit and scope confirmation
I open your file, map every formula and dependency, and confirm exactly which parts become forms, which become automatic calculations, and which become reports. You approve the plan before I build anything.
Rebuild the calculation logic
I rebuild your formulas in JavaScript and test them against your original file so the numbers match, row for row. Nothing is approximated or rounded differently.